Ixion is a Sega prototype I added to MAME many, many years ago. I was checking it recently and noticed at some point the sprite/fg priority had been flipped, leaving the game near unplayable. I also noticed the fg colour hookup I'd used was the wrong one. 
Fixing the FG colour hookup causes the score to be rendered in white, and the Ixion letters to light correctly when you pick them up. There are still unused bits in the PROM however, it is unknown if they have meaning.
This is actually a very interesting game, probably one of the most 'Namco-like' things Sega ever developed, and it's a shame it didn't see wider distribution. It uses a stick / spinner type input (maybe a twisty stick?) and is a lot of fun.
and by added many many years ago, apparently I mean May of 2001.. 20 years ago. Ouch.
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